Added Array::with_validity

[ritchie46]

This adds with_validity(&self, validity: Option<Bitmap>) -> Result<Box<dyn Array>> to the dyn Array trait. This allows creating a new array with the new validity without downcasting.

[codecov]

Codecov Report

Merging #399 (493ddd4) into main (f326fed) will decrease coverage by 0.23%.
The diff coverage is 13.25%.

@@            Coverage Diff             @@
##             main     #399      +/-   ##
==========================================
- Coverage   81.13%   80.89%   -0.24%     
==========================================
  Files         347      347              
  Lines       21991    22086      +95     
==========================================
+ Hits        17842    17867      +25     
- Misses       4149     4219      +70     

Impacted Files	Coverage Δ
src/array/binary/mod.rs	73.91% <0.00%> (-9.70%)	⬇️
src/array/boolean/mod.rs	63.41% <0.00%> (-15.38%)	⬇️
src/array/dictionary/mod.rs	58.82% <0.00%> (-10.95%)	⬇️
src/array/fixed_size_binary/mod.rs	41.79% <0.00%> (-5.67%)	⬇️
src/array/fixed_size_list/mod.rs	47.45% <0.00%> (-7.45%)	⬇️
src/array/list/mod.rs	71.79% <0.00%> (-8.21%)	⬇️
src/array/mod.rs	58.97% <ø> (ø)
src/array/null.rs	38.46% <0.00%> (-3.21%)	⬇️
src/array/struct_.rs	37.34% <0.00%> (-3.99%)	⬇️
src/array/union/mod.rs	81.00% <0.00%> (-1.66%)	⬇️
... and 12 more

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[jorgecarleitao]

Very close; imo we should keep them equal to keep the invariant useful for people that iterate over one or the other without fear of going out of bounds.

[jorgecarleitao]

Thanks a lot, @ritchie46 !